/Engine/Plugins/FX/Niagara/Source/NiagaraCore/Public/NiagaraCore.h
bool operator<< ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [FNiagaraVariableCommonReference](API\Plugins\NiagaraCore\FNiagaraVariableCommonReference) & VariableReference )